package com.xj.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.xj.reggie.common.BaseContext;
import com.xj.reggie.common.R;
import com.xj.reggie.entity.ShoppingCart;
import com.xj.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @Author XJ
 * @Date 2022/10/25 15:46
 * @PackageName:com.xj.reggie.controller
 * @ClassName: ShoppingCartController
 * @Description: TODO
 * @Version 1.0
 */
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

	@Autowired
	private ShoppingCartService shoppingCartService;

	/**
	 * 添加购物车
	 *
	 * @param shoppingCart
	 * @return
	 */
	@PostMapping("/add")
	public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {
		log.info("购物车数据:{}", shoppingCart);

		//设置用户id，指定当前是哪个用户的购物车数据
		Long currentId = BaseContext.getCurrentId();
		shoppingCart.setUserId(currentId);

		//查询当前菜品或者套餐是否在购物车
		Long dishId = shoppingCart.getDishId();

		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId, currentId);

		if (dishId != null) {
			//添加到购物车的是菜品
			queryWrapper.eq(ShoppingCart::getDishId, dishId);

		} else {
			//添加到购物车的是套餐
			queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
		}

		//查询当前菜品或者套餐是否在购物车中
		//SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
		ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

		if (cartServiceOne != null) {
			//如果已经存在，就在原来数量基础上+1
			Integer number = cartServiceOne.getNumber();
			cartServiceOne.setNumber(number + 1);
			shoppingCartService.updateById(cartServiceOne);
		} else {
			//如果不存在，则添加到购物车，数量默认就是1
			shoppingCart.setNumber(1);
			shoppingCart.setCreateTime(LocalDateTime.now());
			shoppingCartService.save(shoppingCart);
			cartServiceOne = shoppingCart;
		}

		return R.success(cartServiceOne);
	}

	/**
	 * 查看购物车
	 *
	 * @return
	 */
	@GetMapping("/list")
	public R<List<ShoppingCart>> list() {

		log.info("查看购物车");

		LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
		queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

		List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
		for (ShoppingCart shoppingCart : list) {
			if (shoppingCart.getNumber()==0){
				Long id = shoppingCart.getId();
				shoppingCartService.removeById(id);
			}
		}
		//删除后重新查询
		list=shoppingCartService.list(queryWrapper);
		return R.success(list);
	}

	/**
	 * 清空购物车
	 * @return
	 */
	@DeleteMapping("/clean")
	public R<String> clean(){
		//SQL:delete from shopping_cart where user_id = ?

		LambdaQueryWrapper<ShoppingCart> queryWrapper =new LambdaQueryWrapper<>();
		queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

		shoppingCartService.remove(queryWrapper);

		return R.success("清空购物车成功");
	}

	/**
	 * 减少购物车
	 *
	 * @param shoppingCart
	 * @return
	 */
	@PostMapping("/sub")
	public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart) {
		log.info("购物车数据:{}", shoppingCart);

		//设置用户id,指定当前购物车是哪个用户的数据
		Long currentId = BaseContext.getCurrentId();
		shoppingCart.setUserId(currentId);
		//查询当前菜品或套餐是否在购物车中
		Long dishId = shoppingCart.getDishId();
		LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
		lqw.eq(ShoppingCart::getUserId,currentId);

		if(dishId!=null){
			//添加到购物车的是菜品
			lqw.eq(ShoppingCart::getDishId,dishId);
		}else {
			//添加到购物车的是套餐
			lqw.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
		}
		//查询当前菜品或套餐是否在购物车中
		ShoppingCart cartServiceOne = shoppingCartService.getOne(lqw);
		//获取number值
		Integer number = cartServiceOne.getNumber();
		//如果已存在,在原来的数量上减一
		cartServiceOne.setNumber(number-1);
		//提交修改语句
		shoppingCartService.updateById(cartServiceOne);

		//返回结果
		return R.success(cartServiceOne);

	}
}
